Where does “nival” come from?

nival (English) comes from Latin nivalis, from Latin nix, from Latin -eus, from Ancient Greek -εῖος, from Proto-Indo-European -iHwós, from Proto-Indo-European -wós — Creates adjectives from verb stems.

nival (English): Abounding with snow; snowy; snow-covered; Found...

Definitions

Abounding with snow; snowy; snow-covered; Found...

Ancestry of “nival”, step by step

Step	Language	Word	Meaning
1	Latin	nivalis	snowy; snow-covered
2	Latin	nix	snow; white hair
3	Latin	-eus	argentum + API → argenteus; ferrum + API →...
4	Ancient Greek	-εῖος	Forms adjectives, usually with a meaning of "of"...
5	Proto-Indo-European	-iHwós	—
6	Proto-Indo-European	-wós	Creates adjectives from verb stems

Every word from Proto-Indo-European -wós →